Pretty much everything in the half-joking review sample text and then some, the things our clients do to machines never ceases to amaze me, from milk and coffee spills on Apple gear, to IBMs that have had something between display and keyboard in just the right spot to totally destroy the LCD and keyboard in one go.. Not to mention something that was literally thrown out a second-story window onto pavement.
So far the tools have held up nicely, we've had other kits for far longer but over time the bits were misplaced and disorganized by all the other technicians, so I just bought my own personal set and some other general things for the shop's tools.
If you think to yourself 'I'll never need 54 kinds of bit..' even in a small-volume shop, you'll find out quickly that most major manufacturers use a good mix of sizes on even just one machine. Get the big kit with 99.5% of the 'common' bits in it now and save having to explain to a client that their simple repair is delayed three days because you had to order a special screwdriver just to open the case.
Magnetizer / Demagnetizer
Magnetic Pickup Tool
Mako Driver Kit - 64 Precision Bits